bug-plan-creator

A command that investigates a software bug from logs, stack traces, user reports, or other input and produces a detailed plan for fixing the code structure.

In plain words
What is it for?
Use it to investigate errors, inspect relevant code and logs, identify likely causes, and specify the files and code changes needed for a bug fix.
Why use it?
It turns scattered error information into a clear investigation and implementation plan. It only uses view-only Git commands, so it does not change repository history or state.

Command

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

agentmods
npx agentmods add commands/gantisstorm/essentials-claude-code/bug-plan-creator
Clone the repo
git clone --depth 1 https://github.com/GantisStorm/essentials-claude-code
Per session 18 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 950 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
Origin original No closer match found in the catalogue.
Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

ModelPer sessionOnce invoked
Fable 5 $0.00018 $0.00950
Opus 5 $0.00009 $0.00475
Sonnet 5 $0.00004 $0.00190
Haiku 4.5 $0.00002 $0.00095

Measured yesterday against content hash 376a85b799de, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

bug-plan-creator scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured yesterday.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

essentials/commands/bug-plan-creator.md · 114 lines

How it starts

The opening of the file, as written. The whole thing — 114 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Bug Investigation & Architectural Fix Planning

Investigate bugs from any input - error logs, stack traces, user reports. Creates an architectural fix plan with exact code specifications.

Use the right tool:

  • Bug fixes/bug-plan-creator (this command)
  • New features/enhancements/plan-creator
  • Code quality improvements/code-quality-plan-creator

Note: Only view-only git commands allowed (no state modifications).

Arguments

Takes any input — error info, file paths, reference material:

  • Error logs: "TypeError: 'NoneType' at auth.py:45"
  • Stack traces: "$(cat stacktrace.txt)"
  • Log files: ./logs/error.log
  • User reports: "Login fails when user has no profile"
  • Diagnostic instructions: "Check docker logs for api-service"
  • Reference files: pass a code map, design doc, or any file as additional context

Instructions

Step 1: Process Input

Parse $ARGUMENTS:

  • If file path → use Read tool to load contents
  • If inline text → extract error signals
  • If diagnostic instructions → execute commands:
    • Docker logs: docker logs <container> --tail 500
    • Process logs: journalctl -u <service>

Step 2: Ask Clarifying Questions

Use AskUserQuestion to gather missing context. Ask only what's unclear — skip questions the user already answered in their input.

Questions to consider (ask 1-4 based on what's missing):

  • Reproduction: Can you reproduce this? Always, intermittent, or specific conditions?
  • Timeline: When did this start? Any recent changes (deploys, config, dependencies)?
  • Impact: What's affected? Any workarounds currently in use?
  • Environment: Any relevant environment details? (OS, versions, prod vs dev, config differences)

If the input is already detailed enough (clear error, obvious reproduction, sufficient context from logs), skip this step entirely and go straight to Step 3.

Step 3: Launch Agent

Assemble the enriched prompt from gathered logs/errors + clarifying answers. Launch background agent:

Read the full file on GitHub · 114 lines

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

  1. yesterday First seen · 114 lines · 18 tokens per session scan A 376a85b799de

Subscribe to this mod's changes

bug-plan-creator is a command published in the GitHub repository GantisStorm/essentials-claude-code (91 stars, last pushed 6mo ago), licensed Unlicense. It adds 18 tokens to every session and 950 once invoked, about $0.0001 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.